US8333818B2 - Filter element and compressed air filter for separating foreign matter from a compressed air stream - Google Patents

Filter element and compressed air filter for separating foreign matter from a compressed air stream Download PDF

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Publication number
US8333818B2
US8333818B2 US13/155,895 US201113155895A US8333818B2 US 8333818 B2 US8333818 B2 US 8333818B2 US 201113155895 A US201113155895 A US 201113155895A US 8333818 B2 US8333818 B2 US 8333818B2
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Prior art keywords
sealing
filter
housing
filter element
compressed air
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US13/155,895
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US20110296999A1 (en
Inventor
Andreas Foerster
Norbert Fischer
Michael Feisthauer
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Kaeser Kompressoren AG
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Kaeser Kompressoren GmbH
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Assigned to KAESER KOMPRESSOREN GMBH reassignment KAESER KOMPRESSOREN GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FEISTHAUER, MICHAEL, FISCHER, NORBERT, FOERSTER, ANDREAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411—Filter cartridges
    • B01D46/2414—End caps including additional functions or special forms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002—Casings; Housings; Frame constructions
    • B01D46/0004—Details of removable closures, lids, caps or filter heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0039—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2271/00—Sealings for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2271/02—Gaskets, sealings
    • B01D2271/027—Radial sealings

Definitions

  • the present invention relates to a filter element and a compressed air filter for separating foreign bodies from a compressed air stream.
  • the present invention can be used in any filter systems, the present invention and the problem addressed by it are explained in greater detail in relation to a compressed air filter. However, the notion of the present invention can also be used, for example, in a fluid separator or the like.
  • Conventional compressed air filters generally comprise a two-piece housing having a housing upper portion and a housing cap which are either screwed together or connected to each other by means of a cap nut or bayonet-type closure.
  • the housing upper portion generally has an intake channel and a discharge channel at diametrically opposed sides.
  • the intake channel opens either centrally into a hollow-cylindrical replaceable filter element, which is introduced or screwed into the housing upper portion in a sealing manner, or into the annular space between the filter element and the filter housing.
  • the discharge channel extends either from the annular space or from the interior of the filter element depending on whether the filter element is to be subjected to flow in an outward direction or in an inward direction.
  • the direction of flow in the filter is generally fixed after fitting and cannot be changed in the fitted position.
  • the field of application of the filter is also generally fixed at the same time as the direction of flow.
  • the filter element is generally subjected to flow from the outer side and is subjected to flow from the inner side in order to separate compressed air condensate during coalescence filtration.
  • the filter elements are generally maintenance parts which have to be changed after a given time owing to the occurrence of contamination.
  • the filter element generally comprises an element lower portion, an element upper portion and a filter medium which is sealingly connected, usually adhesively-bonded, to the element lower portion and the element upper portion in order to form a predetermined gas flow path through the filter medium.
  • a housing seal In addition to a sealing connection between the element upper portion of the filter element and the housing upper portion of the filter housing, a housing seal must also be provided between the housing upper portion and the housing cap of the filter housing in order to close the filter housing after assembly in a pressure-tight manner with respect to the environment and consequently not to allow any compressed air to be discharged. That housing sealing is generally provided separately from the filter element and, according to the prior art, is usually inserted in the form of a radially acting O-ring seal in an O-ring recess in the housing upper portion or in the housing cap of the filter housing.
  • the publication EP 1 343 574 B1 describes a compressed air filter, in which a seal is constructed between the housing upper portion and the housing cap of the filter housing by means of a radial O-ring seal.
  • the O-ring seal is inserted in a corresponding radial recess in the housing cap and adjoins an associated cylindrical outer face of the housing upper portion in a radially sealing manner in the closure position in order to ensure radial sealing.
  • Publication DE 103 09 428 B4 describes a compressed air filter, in which a plurality of housing seals are located at the front side between the housing cap and the housing upper portion of the filter housing.
  • the filter element is not retained axially in the housing cap but instead still remains connected to the housing upper portion or is retained by the seal between the element upper portion and the housing upper portion after the housing cap has been loosened.
  • the housing cap In order to disassemble the filter element in such a case, therefore, either the housing cap generally has to be axially pulled off over the entire length of the filter element or the filter element has to be loosened by hand through the gap between the housing upper portion and the housing cap with the housing cap being partially pulled off.
  • the spatial requirement is disadvantageous and, in the second case, contact with the contaminated filter element is disadvantageous and handling for the user is extremely complicated because it is necessary simultaneously to hold the housing cap and to loosen the filter element.
  • An object of the present invention is to overcome the above-mentioned disadvantages and to provide a filter element which is improved over the prior art and a compressed air filter which is improved over the prior art.
  • the notion forming the basis of the present invention involves providing a filter element which is for separating foreign bodies from a compressed air stream and which has an element lower portion; an element upper portion which has a neck portion which forms a first flow channel and a collar portion which is constructed so as to extend at least partially around the neck portion and which is connected to the neck portion so as to form a second flow channel; and a filter medium which is sealingly connected to the element lower portion and the element upper portion in order to form a gas flow path between the first flow channel and the second flow channel through the filter medium; the collar portion having an abutment face, which is provided at least partially at the outer periphery and which tapers in the direction of the element lower portion, in order to receive an associated sealing element in such a manner that a force which acts substantially axially on the sealing element from the direction of the element lower portion brings about radial expansion of the sealing element along the abutment face.
  • the present invention is further based in this regard on the notion of providing a compressed air filter which is for separating foreign bodies from a compressed air stream and which has the above-described filter element according to the invention; and a filter housing which receives the filter element in a sealing manner and which has a housing upper portion having a first sealing face, which is associated with the sealing element of the filter element and which is provided at least partially at the inner periphery, and a housing cap having a second sealing face which is associated with the sealing element of the filter element and which is provided at least partially at the front side; the housing cap being able to be connected to the housing upper portion by means of a closure movement of the filter housing in order to form a sealing closure position; and the filter element being able to be connected to the housing upper portion and the housing cap in such a manner that the closure movement of the filter housing brings about a relative movement which is directed substantially axially towards each other between the collar portion of the filter element and the housing cap, whereby the second sealing face of the housing cap radially expands the sealing element along
  • a filter element which is for separating foreign bodies from a compressed air stream and which has an element lower portion; an element upper portion which has a neck portion which forms a first flow channel and a collar portion which is constructed so as to extend at least partially around the neck portion and which is connected to the neck portion so as to form a second flow channel; and a filter medium which is sealingly connected to the element lower portion and the element upper portion in order to form a gas flow path between the first flow channel and the second flow channel through the filter medium; the collar portion having a sealing element receiving portion, which is provided at least partially at the outer periphery, at least one connection channel between one of the two flow channels and the sealing element receiving portion and sealing element fixing portions, which axially delimit the sealing element receiving portion, for securely and sealingly receiving peripheral portions of an associated sealing element in such a manner that an excess pressure, which is supplied by the at least one connection channel and which acts on the sealing element, brings about expansion of the sealing element in the direction towards the outer side in
  • another notion forming the basis of the present invention is further to provide a compressed air filter which is for separating foreign bodies from a compressed air stream and which has the above-mentioned filter element; and a filter housing which sealingly receives the filter element and which has a housing upper portion having a first sealing face, which is associated with the sealing element of the filter element and which is provided at least partially at the inner periphery, and a housing cap having a second sealing face which is associated with the sealing element of the filter element and which is provided at least partially at the front side; the filter element being able to be connected to the housing upper portion and the housing cap in such a manner that the sealing element expands in the closure position of the filter housing when an excess pressure occurs through the at least one connection channel in the region of the sealing element receiving portion into sealing abutment with the first sealing face of the housing upper portion and into sealing abutment with the second sealing face of the housing cap.
  • the present invention has the advantage over known approaches in accordance with the prior art that only small assembly forces are necessary when the filter housing is opened or closed before or after the filter element is changed.
  • the housing cap can further be inserted into the housing upper portion together with the filter element with a small assembly force because substantial friction forces between the sealing element and the abutment face with the collar portion and the sealing faces on the housing upper portion and the housing cap have to be overcome only at the end of the housing closure movement, or abutment of the sealing element against the correspondingly associated sealing faces occurs only when the compressed air filter is subjected to compressed air, whereby practically no friction forces have to be overcome.
  • the filter element can advantageously be assembled or disassembled together with the housing cap, which substantially facilitates handling.
  • the spatial requirement for closing or opening the housing cap downwards if the filter element is changed is thereby further reduced.
  • direct hand contact by the user with the contaminated filter element is advantageously ensured by a simple locking mechanism which can readily be disengaged such as, for example, a positive-locking connection between the element upper portion and the housing cap, when the filter element is removed together with the housing cap when the filter housing is opened.
  • Handling is further simplified because only one component, that is to say, the housing cap with the filter element fixed therein, has to be introduced. Consequently, this can be carried out with two hands which is advantageously a substantially simpler operation in the case of relatively large housing caps which are sometimes very heavy.
  • the corresponding housing seal is also automatically changed each time the filter element is changed because the housing seal is provided on the filter element, which advantageously prevents any leaks as a result of worn seals.
  • the present invention further provides the advantage that reliable and simple housing sealing is brought about by means of a sealing element which is reliably pressed against the housing sealing gap by the pressure difference in such a manner that the sealing cannot be impaired by occurrences of settlement of the seal.
  • the collar portion is constructed so as to extend around the entire periphery of the neck portion and in a substantially rotationally symmetrical manner relative to the centre axis of the filter element.
  • the abutment face of the collar portion is preferably also provided so as to extend around the entire periphery and is also constructed in a substantially rotationally symmetrical manner relative to the centre axis of the filter element.
  • the abutment face of the collar portion is in the form of a cone face whose pitch or cone angle ⁇ between the abutment face and the centre axis of the filter element is preferably between 25° and 65°.
  • ⁇ pitch or cone angle between the abutment face and the centre axis of the filter element
  • the collar portion of the filter element has a delimiting rib which delimits the abutment face in the direction of the element upper portion and which is preferably constructed in a peripheral manner and also so as to be substantially rotationally symmetrical relative to the centre axis of the filter element. That construction is also advantageous in a production method using injection-moulding technology.
  • the sealing element is in the form of a sealing ring and can be drawn on the collar portion in a predetermined retention position with slight radial pretension. It is thereby ensured that the sealing ring is prevented from becoming lost even if the filter element is in the disassembled state.
  • the sealing ring has in this predetermined retention position an outer diameter which is smaller than or equal to the diameter of the inner peripheral face or first sealing face in the housing upper portion, which face the sealing ring adjoins in a sealing manner in the assembled state.
  • the sealing ring is in the form of an O-ring with a substantially circular cross-section. Consequently, cost-effective standard components or standard O-rings can be used as the sealing ring.
  • the abutment face of the collar portion is constructed so as to be resiliently deformable or resilient in order to maintain permanent, resilient pretensioning of the sealing ring.
  • the cone face or the abutment face of the collar portion can be divided, for example, radially into individual resilient segments. Permanently resilient pretensioning of the sealing ring is thereby ensured so that any reduction in the pretensioning force of the sealing ring owing to age can be compensated for.
  • the collar portion of the filter element is securely connected to the neck portion by means of a plurality of ribs, the plurality of ribs preferably being constructed in an optimised manner in technical flow terms. Those ribs ensure a secure connection of the collar portion with respect to the neck portion of the filter element so as to form the second flow channel which extends between the neck portion and the collar portion and through which the individual ribs extend.
  • the neck portion of the filter element is constructed so as to have a cross-section which is different from the circular shape and/or has an eccentric position relative to the centre axis of the filter element.
  • the housing upper portion advantageously has a receiving contour which is adapted to the shape of the neck portion in order to form rotation prevention means for the filter element relative to the housing upper portion in the closure position.
  • the element upper portion, the housing cap and/or the housing upper portion has/have at least one optical, acoustic and/or haptic angular position indication device.
  • the times at which the correspondingly necessary relative positions between the housing cap and filter element or housing cap and housing upper portion are reached are thereby readily indicated to the user.
  • the collar portion has at least one optical marking and/or an engagement device as a haptic angular position indication device.
  • any type of indication device is possible which indicates to the user predetermined angular positions of the individual components relative to each other, in particular a highly perceptible, predetermined angular position.
  • the housing cap can be connected, for example, to the housing upper portion by means of a thread-type and/or bayonet-type connection, for example, by means of a bayonet-type connection without any pitch, or the like.
  • a relative rotation is thereby produced between the housing cap and the filter element during the closure movement and brings about relative movement between the collar portion of the filter element and the housing cap in a direction axially towards each other owing to the provision of threaded engagement of those two components.
  • the element upper portion comprises a cylindrical guide portion which faces the element lower portion and which has an outer thread which has a predetermined pitch.
  • the housing cap preferably comprises an inner thread which corresponds to the outer thread of the element upper portion for threaded engagement in order to introduce the filter element into the housing cap or to disengage the filter element from the housing cap.
  • the element upper portion has a cylindrical guide portion which faces the element lower portion and which has a plurality of resiliently deformable resilient tongues whose free ends are arranged in an axial direction so as to face the neck portion and at a different axial level, and whose radial extents and constructions allow the sealing element to be supported in a predetermined retention position.
  • the housing cap preferably has an inner thread which corresponds to the resiliently deformable resilient tongues of the element upper portion. That inner thread of the housing cap is preferably constructed as a saw-tooth-like profile.
  • the inner thread of the housing cap extends axially in the direction of the second sealing face of the housing cap. Consequently, it is advantageously possible to provide a wide sealing face of the housing cap at the front side with a given wall thickness for the housing cap and to ensure that unscrewing the filter element from the housing cap requires the smallest possible number of rotations.
  • the collar portion has an axial stop portion for an axial stop against an associated stop face of the housing upper portion of the filter housing.
  • the housing cap can preferably be connected to the housing upper portion by means of a bayonet-type connection with predetermined pitch.
  • the filter element can preferably be connected to the housing upper portion and the housing cap in such a manner that the closure movement of the filter housing urges the axial stop portion of the collar portion of the filter element into abutment with the associated stop face of the housing upper portion for relative movement between the collar portion of the filter element and the housing cap in a direction substantially axially towards each other.
  • a corresponding stop for an axial support of the filter element against movements in the direction of the housing cap, preferably in the form of a corresponding shoulder on the filter element and/or the housing cap.
  • the collar portion of the filter element has at least one engagement device and the housing cap on the inner wall has at least one associated, corresponding counter-engagement device for engaging connection with the at least one engagement device of the collar portion so that the filter element is advantageously retained in the housing cap by that engaging connection during disassembly of the housing cap from the housing upper portion.
  • the at least one engagement device of the collar portion has a plurality of circumferentially distributed catches which are in the form of projections of the collar portion in the direction of the element lower portion and which each have a receiving region for an engaging receiving member of the associated counter-engagement device of the housing cap, which projections are resilient in a radial direction.
  • the counter-engagement device of the housing cap is, for example, in the form of a plurality of engaging projections which are provided on the inner wall of the housing cap in such a manner that they can be moved into engagement with the associated catches when the bayonet-type connection is in the open position.
  • the catches of the engagement device of the collar portion of the filter element each have at least one predetermined outer edge which is chamfered accordingly in order to provide a relatively flat sliding ramp.
  • at least one lateral edge of the receiving regions of the catches is chamfered accordingly in order to provide a relatively steep sliding ramp when viewed relative to the sliding ramps of the lateral outer edges of the catches.
  • the catches are preferably constructed in such a manner that they take up a radially non-deformed state during the engaging connection with the associated counter-engagement device and during the rest position, in which the catches are out of engagement with the associated engagement device. Since the element upper portion and the catches are advantageously produced as an integral injection-moulded component of plastics material which consequently shows occurrences of creep under extreme deformations or pretensions. Consequently, the flexible resilience of such plastics catches which are pretensioned for a long time in an assembled state of a filter housing or are permanently deformed would be at risk owing to the plastics material having occurrences of creep. Owing to the above-mentioned construction, it may advantageously be ensured that such permanent pretensioning or deformation is avoided.
  • the sealing element is in the form of a sealing ring and particularly a peripheral, annular, specially shaped seal which can be introduced with slight radial pretension into a correspondingly peripheral recess in the collar portion of the element upper portion.
  • the collar portion preferably has two sealing ring fixing portions which are each in the form of a receiving channel which extends around the collar portion in order to securely receive the peripheral portions of the sealing ring with slight radial pretension.
  • the collar portion has a plurality of holes acting as connection channels between the second flow channel and the sealing ring receiving portion.
  • the collar portion particularly has a stop portion which can be moved into abutment with an associated abutment face of the housing cap in a predetermined manner for an axial stop.
  • the free space is provided substantially diametrically in respect of the space to be sealed between the first sealing face of the housing upper portion and the second sealing face of the housing cap at the opposite side of the sealing ring.
  • the sealing ring has its geometric dimensions adapted to the shapes of the first sealing face of the housing upper portion and the second sealing face of the housing cap in such a manner that the sealing ring can be fitted into the space to be sealed between the first sealing face of the housing upper portion and the second sealing face of the housing cap when the filter housing is in the closure position.
  • the sealing ring further preferably has, in the region of the peripheral portions thereof, readily deformable sealing lips which are constructed in terms of their geometric dimensions so that, when the filter housing is in the closure position, the sealing lips can be moved into sealing abutment with an associated inner peripheral face of the housing upper portion and with an associated inner peripheral face of the housing cap. It is thereby advantageously ensured that the housing internal pressure is substantially adjusted at the rear side facing the collar portion whilst a pressure, which is between the housing internal pressure and environmental pressure and is substantially lower than the internal pressure in the housing, is adjusted in the space formed by the sealing lips between the sealing ring, the housing upper portion and the housing cap as a result of the leakage paths outwards. Owing to that pressure difference, the seal portion between the sealing lips is advantageously moved into abutment against the associated sealing faces of the housing upper portion and the housing cap and consequently the housing interior is advantageously sealed relative to the environment.
  • FIG. 1 is a cross-sectional view of a compressed air filter according to a first preferred embodiment of the present invention
  • FIG. 2.1 is a perspective view of an element upper portion of the filter element according to the first preferred embodiment of the present invention.
  • FIG. 2.2 is a side view of the filter upper portion from FIG. 2.1 ;
  • FIG. 2.3 is a top view of the filter upper portion according to FIGS. 2.1 and 2 . 2 ;
  • FIG. 2.4 is a cross-sectional view of part of a compressed air filter according to the first preferred embodiment of the present invention before a closure movement of the filter housing;
  • FIG. 2.5 is an enlarged illustration of cutout A from FIG. 2.4 ;
  • FIG. 2.6 is a cross-sectional view of part of a compressed air filter according to the first preferred embodiment of the present invention after a closure movement of the filter housing;
  • FIG. 2.7 is an enlarged illustration of cutout B from FIG. 2.6 ;
  • FIG. 3.1 is a perspective view of an element upper portion of a filter housing according to a second preferred embodiment of the present invention.
  • FIG. 3.2 is a side view of the filter upper portion from FIG. 3.1 ;
  • FIG. 3.3 is a top view of the filter upper portion according to FIGS. 3.1 and 3 . 2 ;
  • FIG. 3.4 is a cross-sectional view of part of a compressed air filter according to the second preferred embodiment of the present invention before a closure movement of the filter housing or during a closure movement of the filter housing;
  • FIG. 3.5 is an enlarged illustration of cutout C from FIG. 3.4 ;
  • FIG. 3.6 is an enlarged illustration of cutout D from FIG. 3.4 ;
  • FIG. 3.7 is a cross-sectional view of part of a compressed air filter according to the second preferred embodiment of the present invention after a closure movement of the filter housing;
  • FIG. 3.8 is an enlarged illustration of cutout E from FIG. 3.7 ;
  • FIG. 4.1 is a perspective view of an element upper portion of a filter element according to a third preferred embodiment of the present invention.
  • FIG. 4.2 is a side view of the element upper portion from FIG. 4.1 ;
  • FIG. 4.3 is a top view of the element upper portion from FIGS. 4.1 and 4 . 2 ;
  • FIG. 4.4 is a cross-sectional view of part of a compressed air filter according to the third preferred embodiment of the present invention before a closure movement of the filter housing;
  • FIG. 4.5 is an enlarged illustration of cutout F from FIG. 4.4 ;
  • FIG. 4.6 is a cross-sectional view of part of a compressed air filter according to the third preferred embodiment of the present invention after a closure movement of the filter housing;
  • FIG. 4.7 is an enlarged illustration of cutout G from FIG. 4.6 ;
  • FIG. 5.1 is a cross-sectional view of part of a compressed air filter according to a fourth preferred embodiment of the present invention.
  • FIG. 5.2 is an enlarged illustration of cutout H from FIG. 5.1 before the sealing element is subjected to pressure
  • FIG. 5.3 is an enlarged illustration of cutout I from FIG. 5.1 after the sealing element is subjected to pressure.
  • FIG. 1 is a schematic cross-sectional illustration of a compressed air filter 1 according to a first preferred embodiment of the present invention.
  • the compressed air filter 1 has a multiple-piece filter housing 2 which comprises a housing upper portion 3 and a housing cap 4 which can be securely connected thereto.
  • the housing upper portion 3 has an intake and discharge channel 9 and a discharge and intake channel 10 and corresponding connections for the compressed air which is intended to be cleaned or has been cleaned.
  • the compressed air filter 1 further comprises a filter element 5 which can be introduced into the filter housing 2 and which comprises an element lower portion 6 , an element upper portion 7 and a filter medium 8 and, according to the present embodiment, is preferably constructed in a rotationally symmetrical manner relative to the centre axis 46 thereof with the exception of a neck portion 13 and ribs 15 .
  • the filter medium is wound or pleated in the form of a hollow cylinder and is sealingly connected to the element upper portion 7 and the element lower portion 6 of the filter element 5 securely or releasably, for example, adhesively-bonded in a suitable, sealing manner.
  • the filter medium 8 may also comprise a filling of a granular filter medium, such as, for example, activated carbon in a carrier construction, or a porous hollow body.
  • the filter element 5 can further be securely connected to the housing cap 4 , with such a connection being brought about, for example, by means of a threaded connection 11 according to this embodiment, as can be seen in FIG. 1 .
  • the housing cap 4 can further be sealingly connected securely to the housing upper portion 3 in a closure position by means of a rotary connection 12 .
  • the filter element 5 in the filter housing 2 separates the intake side from the discharge side in such a manner that the compressed air to be filtered has to flow through the filter medium 8 .
  • the element upper portion 7 is sealingly introduced into the filter housing 2 so that the inner space of the hollow-cylindrically arranged filter medium 8 is connected to the intake or discharge side 9 and the outer space of the hollow-cylindrically arranged filter medium 8 is connected to the discharge or intake side 10 of the housing upper portion 3 .
  • the compressed air flows in the closure position of the compressed air filter 1 through the intake channel 9 and a neck portion 13 of the element upper portion 7 into the interior of the filter medium 8 , through the cylindrical wall of the filter medium 8 for separating foreign bodies from the compressed air stream and via the flow channel which is formed between the outer wall of the filter medium 8 and the inner wall of the housing cap 4 and the flow channel which is formed between the neck portion 13 and an associated collar portion 14 of the element upper portion 7 of the filter element 5 to the discharge channel 10 of the housing upper portion 3 .
  • FIGS. 2.1 , 2 . 2 and 2 . 3 are various views of an element upper portion 7 of the filter element 5 according to a first preferred embodiment of the present invention and FIGS. 2.4 to 2 . 7 are cross-sectional views of part of a compressed air filter 1 according to the first preferred embodiment of the present invention before and after a closure movement of the filter housing 2 .
  • the element upper portion 7 has a neck portion 13 which has already been mentioned above and which has a cross-sectional shape which differs from the circular shape, for example, a shape similar to a highly rounded triangular shape.
  • the neck portion 13 is further positioned eccentrically relative to the centre axis 46 of the filter element 5 .
  • the neck portion 13 forms a portion of the element upper portion 7 projecting forwards in the direction of the associated housing upper portion 3 and is connected to the collar portion 14 which extends around the neck portion 13 by means of a plurality of ribs 15 .
  • the ribs 15 extend substantially in a radial and simultaneously axial direction and preferably have a construction which is optimised in technical flow terms in order to reduce the pressure difference.
  • individual ribs 15 are constructed therefor so as to have specific curvature.
  • the ribs 15 allow the compressed air to flow in a longitudinal direction of the filter element 5 between the neck portion 13 and the collar portion 14 of the element upper portion 7 .
  • the collar portion 14 is, according to the first embodiment illustrated, constructed so as to be rotationally symmetrical relative to the centre axis 46 of the filter element 5 and so as to extend around the entire periphery of the arranged neck portion 13 .
  • the collar portion 14 preferably has an outer diameter which substantially corresponds to the outer diameter of the associated front side of the housing cap 4 .
  • the neck portion 13 and/or the associated receiving contour thereof in the housing upper portion 3 further comprises a seal 44 which is received in an associated groove 45 and which acts as a fluid-tight connection between the neck portion 13 and the corresponding intake or discharge channel 9 in the housing upper portion 3 .
  • the collar portion 14 comprises an abutment face 16 directed towards the outer side in the region facing the neck portion 13 .
  • the abutment face 16 serves to receive an associated O-ring 22 and is constructed so as to be substantially rotationally symmetrical relative to the centre axis 46 of the filter element 5 and to extend around it.
  • the diameter of the abutment face 16 tapers in a predetermined manner in the direction towards the element lower portion 6 .
  • the abutment face 16 is in the form of a cone face whose centre axis coincides with the centre axis 46 of the filter element 5 .
  • the notional tip of the cone is directed in the direction towards the element lower portion 6 and comprises a pitch in the range between 1:2 and 2:1, that is to say, a pitch angle ⁇ between the abutment face 16 and the centre axis 46 of the filter element 5 preferably between approximately 25° and 65°.
  • a pitch angle ⁇ between the abutment face 16 and the centre axis 46 of the filter element 5 preferably between approximately 25° and 65°.
  • the abutment face 16 may also have a pitch which changes constantly or in specific portions.
  • the abutment face 16 is delimited in the direction of the neck portion 13 by a delimiting rib 17 which is also preferably peripheral and which is rotationally symmetrical relative to the centre axis 46 of the filter element 5 .
  • the abutment face 16 is delimited by a peripheral channel 18 which is rotationally symmetrical relative to the centre axis 46 of the filter element 5 and which merges in the direction of the element lower portion 6 into a substantially cylindrical guide portion 19 of the collar portion 14 , with which the collar portion 14 is received and centred in the housing cap 4 .
  • the collar portion 14 further has at the cylindrical guide portion 19 an outer thread 20 which can be moved into threaded engagement with an accordingly corresponding inner thread 21 of the housing cap 4 .
  • the filter element 5 can be securely screwed into the housing cap 4 by means of that threaded connection 11 .
  • a sealing ring 22 is also provided which is preferably constructed as a conventional O-ring with a substantially circular cross-section of the sealing cord.
  • the sealing ring 22 is drawn on the abutment face 16 preferably with slight radial pretension in a predetermined retention position.
  • the outer diameter of the sealing ring 22 is, in that retention position, on the collar portion 14 or the abutment face 16 , smaller than or equal to the diameter of the inner peripheral face 23 of the housing upper portion 3 which forms the first sealing face 23 in the housing upper portion 3 and which the sealing ring 22 sealingly adjoins in the assembled state in the closure position.
  • the end face of the housing cap 4 forms the second sealing face 24 of the filter housing 2 , against which the sealing ring 22 is resiliently moved into abutment by a closure movement of the filter housing 2 and consequently in the closure position according to an operating principle which is described below in greater detail.
  • the abutment face 16 on the collar portion 14 may be constructed so as to be resilient, for example, in the form of individual, radially divided and flexibly resilient segments.
  • FIGS. 2.4 to 2 . 7 FIGS. 2.4 and 2 . 5 illustrating a state before the closure movement of the filter housing 2
  • FIGS. 2.6 and 2 . 7 illustrating a state after the closure movement of the filter housing 2 .
  • the housing upper portion 3 has a corresponding receiving contour 25 , the neck portion 13 being able to be introduced into the receiving contour 25 in order to provide rotation prevention means for the filter element 5 about the longitudinal axis thereof relative to the housing upper portion 3 . It is obvious to a person skilled in the art that a desired rotation prevention means is also possible particularly owing to the cross-section of the neck portion 13 being constructed so as to be different from the circular shape and with a central arrangement thereof at the same time.
  • the rotary connection 12 between the housing cap 4 and the housing upper portion 3 is in the form of a bayonet-type connection so that the assembly of the housing cap 4 on the housing upper portion 3 is associated with a rotational movement of the housing cap 4 about the longitudinal axis thereof relative to the housing upper portion 3 .
  • the rotary connection 12 can also be constructed by means of a suitable threaded connection or the like.
  • a bayonet-type connection without any pitch is preferably used in such a manner that the closure rotation between the housing cap 4 and the housing upper portion 3 is carried out without any relative axial movement between those two components.
  • the filter element 5 In order to introduce the filter element 5 into the filter housing 2 , the filter element 5 is first screwed into the housing cap 4 by means of the threaded connection 11 or the inner thread 21 and the outer thread 20 until the sealing ring 22 loosely adjoins the second sealing face 24 or the corresponding end face of the housing cap 4 . In that state, the sealing ring 22 is pretensioned only slightly and is not yet expanded along the abutment face 16 , as illustrated in FIG. 2.5 .
  • suitable optical markings 26 are preferably provided in this instance on the element upper portion 7 and/or on the housing cap 4 .
  • the relative angular position can also be indicated to the user as haptic markings by resilient engaging projections, for example, on the collar portion 14 and by corresponding counter-contours on the housing cap 4 .
  • the specially constructed and positioned neck portion 13 and the bayonet-type connection 12 between the housing upper portion 3 and the threaded cap 4 it is ensured that the neck portion 13 of the filter element 5 in a predetermined angular position can be introduced in a rotationally secure manner in an axial direction into the corresponding receiving contour 25 on the housing upper portion 3 and, consequently, the housing cap 4 can be introduced into the housing upper portion 3 with the filter element 5 screwed to the housing cap 4 and moved into engagement with the housing upper portion 3 by means of the bayonet-type connection 12 .
  • the angular position of the filter element 5 relative to the housing upper portion 3 is maintained owing to the above-described rotation prevention means, but with relative rotation thereby being produced between the filter element 5 and the housing cap 4 in such a manner that the filter element 5 is moved further into the housing cap 4 .
  • the pitch of the threaded connection 11 that is to say, the pitch of the outer thread 20 and the inner thread 21 , determines the magnitude of the relative movement between the filter element 5 and the housing cap 4 at a predetermined angle of rotation of the housing cap 4 relative to the housing upper portion 3 .
  • the collar portion 14 of the filter element 5 is screwed further into the housing cap 4 during the closure movement of the filter housing 2 ; that is to say, further relative movement is produced between the two and directed towards each other, in such a manner that the second sealing face 24 or the front side of the housing cap 4 urges the sealing ring 22 upwards along the abutment face 16 and brings about expansion of the sealing ring 22 over the abutment face 16 which is accordingly constructed in an inclined manner, as illustrated in particular in FIGS. 2.5 and 2 . 7 .
  • the delimiting rib 17 serves to delimit the expansion of the sealing ring 22 and consequently ensures defined and predetermined expansion of the sealing ring 22 .
  • the ring 22 Owing to that radial expansion of the sealing ring 22 , the ring 22 is also moved into sealing abutment with the first sealing face 23 , that is to say, the inner peripheral face of the housing upper portion 3 , as illustrated in FIG. 2.7 , during the closure movement of the filter housing 2 in addition to the abutment with the second sealing face 24 . Consequently, the sealing ring 22 abuts the first sealing face 23 only at the end of the closure movement of the filter housing 2 , which is advantageous for reasons of friction technology.
  • radial expansion of the sealing ring 22 can also be brought about in an equivalent manner in that, instead of the sealing ring 22 being guided along the abutment face 16 , the sealing ring 22 is radially expanded by the sealing ring 22 being correspondingly squeezed only by means of a compression operation owing to corresponding abutment with a correspondingly constructed abutment face 16 and being subjected to radial expansion owing to that squeezing action.
  • the abutment face 16 may be in the form of a right-angled, L-shaped abutment face or the like. In this instance, it is possible to have any type of abutment face 16 which ensures, when a force acts axially on the sealing ring 22 , compression of the sealing ring 22 in such a manner that it is subjected to radial expansion.
  • the abutment against the two sealing faces 23 and 24 with a build-up of pressure in the filter housing 2 is increased owing to the pressure force of the internal pressure on the sealing ring 22 so that the desired complete and reliable sealing of the filter housing 2 is ensured.
  • the filter element 5 is axially supported on the housing cap 4 by means of the threaded connection 11 in such a manner that, although the sealing ring 22 is resiliently pretensioned in the assembly state in which the filter element 5 is introduced into the housing cap 4 , it is not located in the axial main force path between the housing upper portion 3 and the housing cap 4 .
  • the service-life of the sealing ring 22 is thereby advantageously increased.
  • the disassembly of the compressed air filter 1 for changing a filter element 5 which may be contaminated is carried out similarly to the above-described assembly sequence but in the reverse order.
  • sealing abutment face is intended to be understood to be any type of abutment face 16 which defines the receiving space for receiving the sealing ring 22 in such a manner that a force acting axially on the sealing ring 22 brings about radial expansion of the sealing ring.
  • an L-shaped abutment face or an abutment face with an acute angle between two portions of the abutment face is also intended to be understood and is to be considered to be equivalent to the abutment face 16 illustrated in the figures in accordance with the present application.
  • a compressed air filter 1 and a filter element 5 according to a second preferred embodiment of the present invention are explained in greater detail below with reference to FIGS. 3.1 to 3 . 8 , respectively.
  • the second embodiment of the present invention has, in contrast to the first embodiment, a modified threaded connection 11 between the filter element 5 and the housing cap 4 which is evaluated in greater detail below.
  • the cylindrical guide portion 19 of the collar portion 14 does not have an outer thread but instead a plurality of resiliently deformable resilient tongues 27 .
  • the flexible resilient tongues 27 are arranged along the peripheral face of the guide portion 19 preferably with regular spacing from each other and, as can be seen particularly in FIG. 3.2 , at a different axial level so that a predetermined threaded engagement with an associated inner thread 21 of the housing cap 4 is ensured.
  • the resilient tongues 27 are, for example, in the form of flaps which are punched out of the guide portion 19 and the free end of which is orientated axially in the direction of the neck portion 13 .
  • the resilient tongues 27 extend radially with the free ends thereof before the filter element 5 is introduced into the housing cap 4 preferably substantially as far as the centre of the sealing cord cross-section, as illustrated in FIG. 3.5 , and at a maximum substantially as far as the outer diameter of the sealing ring 22 .
  • the resilient tongues 27 thereby form a bearing device for carrying the sealing ring 22 before the filter element 5 is introduced into the housing cap 4 at a predetermined position.
  • the resilient tongues 27 each to have webs which extend in a substantially radial direction and which serve to support the sealing ring 22 .
  • the resilient tongues 27 can also extend radially beyond the radial extent of the sealing ring 22 .
  • the webs are formed on the free end of the resilient tongues 27 and are constructed in such a manner that they can be displaced into the punched-out openings if the resilient tongues are deformed accordingly.
  • the resilient tongues 27 are further pretensioned in the direction towards the outer side and can be resiliently adjusted in the direction of the centre axis 46 of the filter element 5 owing to the resilient property thereof, as illustrated in FIG. 3.6 .
  • the housing cap 4 preferably has a thread having a saw-tooth-like profile as the inner thread 21 corresponding to the resilient tongues 27 at the inner peripheral face thereof, as illustrated in FIGS. 3.5 and 3 . 6 .
  • the individual thread portions of the inner thread 21 may have different thread depths.
  • the thread depth may extend axially in the direction of the second sealing face 24 of the housing cap 4 .
  • a second sealing face 24 which is as wide as possible is thereby provided for a predetermined wall thickness of the housing cap 4 so that optimised abutment against the associated sealing ring 22 is ensured. Owing to the thread depth extending accordingly, it is further possible for the filter element 5 to be able to be advantageously unscrewed from the housing cap 4 with the smallest possible number of rotations.
  • the filter element 5 can be introduced axially into the housing cap 4 when the sealing ring 22 is retained in a predetermined retention position at the free ends of the resilient tongues 27 .
  • the resilient tongues 27 move into snap-fit engagement with the saw-tooth-like inner thread 21 of the housing cap 4 from a predetermined insertion depth owing to the resilient construction thereof.
  • the filter element 4 can be screwed in further in order to introduce the filter element 5 further into the housing cap 4 because the resilient tongues 27 and the saw-tooth-like profile of the inner thread 21 constitute a type of threaded engagement and allow thread rotation. Disassembly of the filter element 5 is carried out similarly by unscrewing the filter element 5 and consequently the resilient tongues 27 from the inner thread 21 of the housing cap 4 in the opposite direction.
  • introducing or screwing the filter element 5 into the housing cap 4 according to the second embodiment also produces further insertion of the filter element 5 into the housing cap 4 in such a manner that the second sealing face 24 radially expands the sealing ring 22 along the abutment face 16 , as illustrated in FIG. 3.6 , and urges it into sealing abutment with the first sealing face of the housing upper portion 3 (not illustrated).
  • a compressed air filter 1 and a filter element 5 according to a third preferred embodiment of the present invention is explained in greater detail below with reference to FIGS. 4.1 to 4 . 7 , respectively.
  • the rotary connection 12 between the housing upper portion 3 and the housing cap 4 is constructed as a bayonet-type connection having a predetermined pitch so that the housing upper portion 3 and the housing cap 4 carry out relative axial movement in a direction towards each other during closure movement of the filter housing 2 .
  • a stop device 28 is also provided which produces an axial stop between the collar portion 14 of the element upper portion 7 and the housing upper portion 3 in order to axially move the element upper portion 7 and consequently the abutment face 16 of the collar portion 14 relative to the housing cap 4 during a closure movement of the filter housing 2 .
  • the stop device 28 preferably comprises a stop face of the front end portion of the collar portion 14 facing the housing upper portion 3 and a correspondingly associated stop portion of the housing upper portion 3 facing the collar portion 14 , as illustrated, for example, in FIGS. 4.5 and 4 . 7 .
  • the stop device 28 brings about a stop between the stop face of the collar portion 14 of the filter element 5 and the correspondingly associated stop portion of the housing upper portion 3 , during the closure movement of the filter housing 2 and the associated relative axial movement between the housing upper portion 3 and the housing cap 4 , in such a manner that relative axial movement in a direction towards each other is brought about between the filter element 5 and the housing cap 4 .
  • That relative movement again urges the sealing ring 22 along the abutment face 16 and radially expands the sealing ring 22 accordingly into sealing abutment with the associated first sealing face 23 in a resiliently pretensioned state, similarly to the embodiments already explained above.
  • a connection between the filter element 5 and the housing cap 4 is not produced by means of a corresponding threaded connection but instead by means of a suitably constructed engaging connection 29 which is explained in greater detail below.
  • the element upper portion 7 has, for example, two engagement devices in the form of catches 30 which are preferably in the form of projections of the collar portion 14 in the direction of the element lower portion 6 and constructed so as to be peripherally offset by approximately 180°, which projections are resilient in a radial direction.
  • the catches 30 each form a projection in the direction of the element lower portion 6 of an associated rib 15 .
  • the catches 30 further preferably have a substantially rectangular construction with rounded lateral edges.
  • Each catch 30 further has a substantially central opening or receiving region 31 for receiving a correspondingly associated counter-engagement device 35 .
  • each catch 30 further comprises chamfered outer lateral edges 32 and at least one chamfered outer lower edge 33 .
  • Chamfered portions which accordingly support a lateral disengagement operation of the correspondingly associated counter-engagement device 35 are further provided at least at the lateral edges 34 of the opening 31 .
  • the housing cap 4 preferably accordingly has, as the counter-engagement device 35 , corresponding engaging projections 35 which are arranged at the inner peripheral face and which slide over the chamfered edges of the catches 30 or the opening 31 of the catches 30 during corresponding engagement and disengagement movements and can consequently be engaged in a corresponding engaging connection with the catches 30 or disengaged from the engaging connection.
  • the engaging projections 35 are constructed in a complementary manner for positionally stable engagement with the associated openings 31 of the catches 30 so that the filter element 5 is engaged with the housing cap 4 in a positionally stable manner in the engaged state.
  • the outer lateral edges 32 of the catches 30 preferably have relatively flat chamfers in relation to relatively steep chamfers of the lateral edges 34 of the opening 31 . Consequently, the application of force for locking engagement between the catch 30 and the associated engaging projection 35 is smaller for the user than the application of force for the corresponding disengagement operation. It is thereby advantageously possible to ensure for the user a haptic preferred angular position of the filter element 5 relative to the housing cap 4 .
  • That preferred angular position is preferably selected in such a manner that the neck portion 13 of the filter element 5 having the correspondingly associated receiving contour 25 can be introduced therein so as to prevent rotation in the housing upper portion 3 and the bayonet-type connection 12 between the housing cap 4 and the housing upper portion 3 can be moved axially into engagement, that is to say, the positioning of the catches 30 and the correspondingly associated engaging projections 35 is preferably selected so that, during an engagement state, the bayonet-type connection between the housing cap 4 and the housing upper portion 3 is in the open position for separating those components from each other. Consequently, the filter element 5 is advantageously retained axially in the housing cap 4 when the housing cap 4 is separated from the housing upper portion 3 by the engaging connection brought about between catches 30 and associated engaging projections 35 .
  • the element 5 is first introduced axially into the housing cap 4 , either already in the corresponding engagement position or in a disengagement position, the engagement position being brought about in that instance by subsequent manual rotation of the filter element 5 .
  • the engagement operation may in this case act as a haptic indication of a preferred angular position for the user.
  • suitable additional or alternative markings 26 for this purpose.
  • the housing cap 4 with the filter element 5 engaged is subsequently introduced into the housing upper portion 3 accordingly and securely connected thereto in a sealing manner owing to closure movement by means of the bayonet-type connection 12 .
  • relative movement between the filter element 5 and the housing cap 4 is thereby produced by the axial stop device 28 , whereby the sealing ring 22 is expanded radially along the abutment face 16 and in sealing abutment with the first sealing face 23 .
  • the operation is carried out in the reverse order in order to remove a filter element 5 which is, for example, contaminated, the filter element 5 still being engagingly connected to the housing cap 4 after the housing cap 4 has been removed from the housing upper portion 3 by the bayonet-type connection 12 being loosened.
  • the engaging connection can be moved out of engagement and the filter element 5 can readily be removed from the housing cap 4 .
  • the catches 30 are further preferably constructed in such a manner that they take up a radially non-deformed state both in the engagement position on the correspondingly associated engaging projections 35 and in the disengagement position remote from the engaging projections 35 . Since the element upper portions 7 are generally produced as injection-moulded components from a suitable plastics material which may exhibit occurrences of creep in some circumstances under permanently extreme deformations or pretensions, that radially non-deformed state of the catches 30 ensures a longer service-life thereof and consequently of the engaging connection between the filter element 5 and the housing cap 4 .
  • the catches may also have a plurality of openings each having correspondingly chamfered edges, for example, two identical openings arranged beside each other per catch.
  • the catches may further each have an open lateral region so that a sliding ramp is provided only at a predetermined side and the associated counter-engagement device is introduced or withdrawn at the opposite side without any sliding ramp in the receiving region of the respective catch. This is intended to be adapted and provided in accordance with the construction of the other components and the direction of rotation during the closure movement. If the catches or a corresponding engagement or counter-engagement device is/are provided, it is further possible to dispense with additional devices for indicating the angular position because the above-described engaging connection can take over that function.
  • a compressed air filter 1 and a filter element 5 according to a fourth preferred embodiment of the present invention are explained below in greater detail with reference to FIGS. 5.1 to 5 . 3 .
  • the collar portion 14 of the element upper portion 7 has a peripheral construction, for example, which is rotationally symmetrical relative to the centre axis 46 of the filter element 5 and which has S-like geometry which is angled twice, as can be seen in particular in FIGS. 5.2 and 5 . 3 .
  • the collar portion 14 comprises a first fixing portion which faces the neck portion 13 and which is in the form of a receiving channel 36 and a second fixing portion facing the element lower portion 6 , also in the form of a receiving channel 37 . Between the first receiving channel 36 and the second receiving channel 37 , the collar portion 14 has a sealing ring receiving portion 38 , the contour of which is adapted to the geometric dimensions of the associated sealing faces of the housing cap 4 and the housing upper portion 3 in the closure position of the filter housing.
  • the collar portion 14 further has a plurality of holes 39 which open out of the sealing ring receiving portion 38 and which connect a free space 40 , which is positioned in front of the sealing ring receiving portion 38 and which has the internal pressure of the filter housing 2 , in particular to the flow region between the outer wall of the filter medium 8 of the filter element 5 and the inner wall of the housing cap 4 .
  • the free space 40 may be in the form of either a peripheral free space or a free space divided into a plurality of portions.
  • the collar portion 14 further comprises a stop portion 47 which is provided, for example, below the second receiving channel 37 as a peripheral projection directed towards the outer side.
  • the stop portion 47 corresponds to an associated abutment face 48 inside the housing cap 4 , for example, in the form of a peripheral step in such a manner that an axial stop is ensured at a predetermined axial closure position when the filter element 5 is introduced into the housing cap 4 , as can be seen in FIGS. 5.2 and 5 . 3 .
  • the collar portion 14 further comprises a specially shaped seal 41 which is adapted in terms of the geometric dimensions thereof to the construction of the abutment face 16 of the collar portion 14 and which can be securely introduced in the fixing portions 36 , 37 with the axial lateral edges thereof.
  • the specially shaped seal 41 delimits in the introduced state the free space 40 between the sealing ring receiving portion 38 of the abutment face 16 and the inner face of the specially shaped seal 41 , as illustrated in FIGS. 5.2 and 5 . 3 .
  • the free space 40 is preferably positioned in the space to be sealed between the first sealing face 23 of the housing upper portion 3 and the second sealing face 24 of the housing cap 4 at the diametrically opposed side of the specially shaped seal 41 when the filter housing 2 is in the closure position.
  • the specially shaped seal 41 has small and readily deformable sealing lips 42 , 43 , preferably each one in a peripheral region, which are in sealing contact with the first sealing face 23 or the associated inner peripheral face of the housing upper portion 3 and an associated inner peripheral face of the housing cap 4 after the filter element 5 has been assembled in the filter housing 2 .
  • the sealing lips 42 , 43 may be constructed in such a manner that they do not bring about complete sealing at the associated faces but instead simply cause the cross-sections of the leakage paths which extend outwards from the housing interior between the housing upper portion 3 and the housing cap 4 to be large in relation to the remaining leakage paths between the sealing lips 42 , 43 and the associated abutment faces.
  • the housing pressure is thereby possible for the housing pressure to be substantially adjusted at the side of the specially shaped seal 41 facing the collar portion 14 in the free space 40 when the compressed air filter 1 is subjected to pressure, whilst a pressure which is between the housing internal pressure and environmental pressure and which is substantially lower than the internal pressure in the filter housing 2 is adjusted in the space which is formed by the sealing lips 42 , 43 between the specially shaped seal 41 , the housing upper portion 3 and the housing cap 4 owing to the leakage paths outwards.
  • the portion of the specially shaped seal 41 between the sealing lips 42 , 43 is moved into sealing abutment with the first and second sealing faces 23 , 24 of the housing upper portion 3 or the housing cap 4 , whereby the housing interior is sealed with respect to the environment as desired.
  • the cross-section profile of the specially shaped seal 41 may be freely selected within a broad range. However, it is necessary to have at least a portion of the specially shaped seal 41 which can be fitted into the free space 40 between the front-side sealing face of the housing cap 4 or the second sealing face 24 and the inner peripheral face of the housing upper portion 3 or the first sealing face 23 . Furthermore, the holes 39 provided can also ensure that the free space 40 is connected to the inner region of the filter medium 8 in order to provide the desired pressure difference.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
US13/155,895 2008-12-18 2011-06-08 Filter element and compressed air filter for separating foreign matter from a compressed air stream Active US8333818B2 (en)

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DE102008054878A DE102008054878B4 (de) 2008-12-18 2008-12-18 Filterelement und Druckluftfilter zum Abscheiden von Fremdstoffen aus einem Druckluftstrom
DE102008054878 2008-12-18
DE102008054878.2 2008-12-18
PCT/EP2009/067529 WO2010070102A1 (de) 2008-12-18 2009-12-18 Filterelement und druckluftfilter zum abscheiden von fremdstoffen aus einem druckluftstrom

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JP (1) JP5489361B2 (ja)
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BRPI0922387A2 (pt) 2020-08-11
MX2011006533A (es) 2011-07-13
DE102008054878B4 (de) 2010-12-23
BRPI0922387B1 (pt) 2021-06-08
JP2012512736A (ja) 2012-06-07
EP2373398B1 (de) 2012-10-10
US20110296999A1 (en) 2011-12-08
WO2010070102A1 (de) 2010-06-24
JP5489361B2 (ja) 2014-05-14
EP2373398A1 (de) 2011-10-12
CA2745560C (en) 2017-02-21
CA2745560A1 (en) 2010-06-24
CN105771465A (zh) 2016-07-20
RU2011122396A (ru) 2013-01-27
CN102256683A (zh) 2011-11-23
AU2009329541B2 (en) 2015-03-12
AU2009329541A1 (en) 2011-06-30
DE102008054878A1 (de) 2010-07-08

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